Spray painting apparatus



Sept. 13, 1949. J. A. BEDE 2,481,813

SPRAY PAINTING APPARATUS Filed July 25, 1947 ATTORNEYS,

Patented Sept. 13, 1949 UNITED STATES PATENT OFFICE SPRAY PAINTING APPARATUS James A. Bede, Cleveland, Ohio Application July 25, 1947, Serial No. 763,488

This invention relates to apparatus for supplying'materials such as coating materials, paint, varnish, lacquer, enamel, plastics and the like to various articles or surfaces.

An object of the invention is to provide an improved method of applying materials which are or may be rendered fluid.

Another object of the invention is to provide an improved apparatus for applying such materials which will more eflectively distribute the S improved apparatus for applying such materials which will eflect more complete atomization of paints and the like during spraying.

Another object of the invention is to provide an improved apparatus which will effect substantial savings in the quantity of material used.

Another object of the invention is to provide an improved apparatus which will produce an improved film of material.

Another object of the invention is to provide an improved apparatus which will be simple in construction.

Another object of the invention is to provide an improved apparatus which will be economical in operation.

Another object of the invention is to provide an improved apparatus which may be kept clean easily.

Another object of the invention is to provide an improved apparatus which will be extremely com-' pact.

Another object of the invention is to provide an improved apparatus to which additional material may easily be supplied.

Another object of the invention is to provide an improved apparatus which will be extremely safe.

Other objects will hereinafter appear.

The invention will be better understood from the description of one practical embodiment thereof, illustrated in the accompanying drawu ings, in which:

Figure 1 is a perspective view of one form of apparatus in operation, and

Figure 2 is a central sectional view, taken on the line IIII of Figure 1, of the heating portion of the apparatus illustrated in the first figure, this being shown to an enlarged scale.

In the apparatus illustrated in the drawing, paint, lacquer, or the like is being supplied to a spray gun by which it is applied to the article. The spray gun itself may be of any desired or well known type, and so is not shown in detail, but is indicated generally at i, being illustrated as held in the hand 2 of the operator and connected by a hose or similar flexible conduit 3 to the parts or the apparatus which are hereinafter ame.

Another object of the invention is to provide an described or may be used by automatic spray fixtures.

The operator uses the gun in the conventional manner, directing its spray 4 onto the surface of a piece I! which he is coating with paint or enamel, as is well understood in the art.

The coating material is hereinafter referred to as paint, irrespective of its character, and is supplied at 6, in a pail or any other suitable container I, which is set within a pressure chamber 8, closed by a cover 9, which is tightly clamped and sealed to the container.

A pipe It extends downwardly through the cover to adjacent the bottom ll of the pail container 8 and practically to the bottom of the pail itself.

The cover 9 carries a pressure pump l2 having actuating handle I3.

The upper end of pipe i0 is shown as provided with an elbow l4 and valve l5, to which is connected a flexible conduit or hose l6, extending to the heating portion of the apparatus.

A stop cock I! is also provided in the cover 9, by which the pressure within container 8 may be relieved as desired.

The heater is shown as supported on legs l8, riveted at is to an inverted cup-shaped bottom piece 20, on which is supported a cylindrical tank 2! surrounded by a jacket of heat insulating material 22.

Extending through the top of tank 2| and heat insulating material 22 are pipes communicating wtih a temperature gage or thermometer 23 and with a pressure relief valve 24.

The top of the heating device is protected by a top 25 consisting of a disc with a depending marginal flange.

Extending upwardly, centrally and coaxial with the tank 21, is a sleeve 26 containing an electrical heating element 21, and around this heating element and spaced therefrom is a helical coil of tubing 28, the lower end of which extends through the wall of tank 2i and heat insulating material 22 to a stop cock 29 which serves as the connection to the end of hose l6 remote from container 8.

The upper end of the tubing of coil 28 similarly extends through the wall of tank 2! and the heat insulating material 22 to stop cook 30, which is connected to the end of hose 3 remote from spray gun I.

A thermostat BI is positioned in the bottom of tank 2| near its outer wall and controls the supply of current to heater element 21.

The operation of the device is as follows:

While a heat conducting liquid is shown, it will be understood that any material capable of retaining quantities of heat may be used, as, for instance, the tank might be filled with solid metal such as aluminum, or fins or other shaped pieces 3 of aluminum, copper, or other heat containing and conducting material might be applied to the coil of pipe.

The operator removes cover 9 from pressure chamber 8 by loosening the clampin means by which these parts are held together, and then deposits his can or pail 1 of paint within the chamber. He then replaces the cover and clamps it into place.

After seeing that valve l and stop cock I! are both tightly closed, he operates the handle of pump l2 to apply air pressure to the surface of the fluid 6, checks the connection of hose II to valve l5 and stop cock 29, and that of hose 3 to stop cock 30 and spray gun I, and turns on the current to supply electricity to heater 21.

When the heater has been operated for a sumcient time to bring the liquid in tank 2| to the proper temperature, which can be determined by the time when thermostat 3| clicks to open the circuit supplying current to the heater, he opens stop cocks 29 and 30 and valve l5, upon which the air pressure on the surface of fluid 8 forces this fluid up pipe in and through hose [6 into coil 28.

It will be noted that the coating fiuid enters the bottom of the coil and circulates in a helical, upward path to the top of this coil, the coil being of relatively large cross section in relation to the jet which will eminate from the spray gun, so that the material passing through the coil moves slowly and reaches substantially the temperature of its heat conducting bath before temperature which I find particularly suitable for many of the commercial coatings being about 180 Fahrenheit.

The actual emission of the coating material is, of course, controlled in the usual manner by the spray gun I, the temperature at the nozzle 01' this gun is generally some 20 to 40 below that existing in the heating coil, due to cooling on passing through hose 3.

It will be noted that the coating material rises constantly on its passage through the heater, and that when the operator is through using the apparatus and releases the pressure within container 8 by opening stop cock l1, any fluid material within the coil 28 is siphoned back into the pail 1.

The cleaning of the easily accomplished by flushing with a solvent. The paint or coating material is after while excessive pressure upon this bath is avoided by the relief valve at 24. It is also appipe I 0 and hose I6 is also parent from the drawing that because of the great length of coil 28 relative to its cross-section diameter, the temperature of said coil is substantially the same as that to which it is desired to raise the coating material. In this way, no portion of the stream of material is subjected to excessive breakdown temperatures as would be the case where a heating element extends only for a short length relative to the cross-section diameter of the conduit through which said material flows.

While I have described the illustrated embodiment of my invention in some particularity, obviously many other embodiments, variations, and modifications will readily occur to those skilled in this art, and I do not, therefore, limit myself to the precise details shown and described herein,

but I claim as my invention all embodiments, modifications and variations coming within the scope of the appended claim.

I claim: A coating apparatus comprising a pressure chamber provided with a removable cover, means to lock said cover in sealin relationship with ends projecting perature responsive control element heating means JAMES A. BEDE.

REFERENCES CITED The following references are of record in the file of this patent:

Number Date Sept. 17, 1918 Sept. 13, 1927 Number Date 363,312

Dec. 15, 1931 

